I prefer people to use my username when I'm talking to people online. It makes me a little uncomfortable when people call me by my first name online, but it doesn't matter too much because my first name is super common.

I don't like my real name, it's really complicated and if English is your first language you're going to have a hard time pronouncing it. I prefer my online name though if we known each other for awhile and I tell you my real name and if you prefer my real name then I won't stop you